Introduction
Our standard concentric double-flanged butterfly valves offer a robust, heavy-duty solution for bi-directional flow control and isolation in high-capacity piping systems. Engineered with a precision-centered disc and stem design, these quarter-turn valves feature an integrated elastomeric seat liner—available in premium EPDM, Buna-N, or Viton®—that ensures a bubble-tight shutoff while preventing line media from contacting the valve body.
Built to meet rigid international manufacturing standards like API 609, AWWA C504, and EN 593, they are constructed with durable cast iron or ductile iron bodies, matching standard pipeline flange patterns. Unlike wafer or lugged styles, the flanged design incorporates integral U-shaped or double-flanged faces with through-holes on both sides of the body, allowing the valve to be securely bolted directly to companion pipe flanges using individual short bolts. This specialized construction provides maximum structural stability, handles higher pipeline stresses, and makes them the ideal choice for water treatment, power generation, and large-diameter intake lines where safe, independent downstream maintenance or dead-end service is required.
Technical Design Features
| Type: | Concentric Butterfly Valve (Resilient Seated) |
| Pressure Class: | PN10 or PN16 |
| Port Size: | 50mm to 450mm |
| Material: | Grey Cast Iron EN-GJL-250 (GG25) or ASTM A126 Gr. B |
| Trim Material: |
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| Connection Type: | Flange to EN 1092 |
| Temperature Rating: | -5° to 160° (Depending on Disc Material) |
| Mounting: | ISO 5211 Compatible Mounting Flange |
| Operation Method: |
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| Lining: | PFA/PTFE Lined Disc can be fitted with PTFE Seat making it a complete corrosive resistant PTFE Lined Butterfly Valve. |
| Design Standards: | Complies to EN 593, API 609 , and MSS SP-67 |
| Testing and Acceptance: | BS EN 12266-1 and/or API 598 |
Main Advantages
| High Structural Stability: | Double-flanged faces handle heavy pipeline stress and bending. |
| Safe Dead-End Service: | Downstream piping can be safely disconnected under full pressure. |
| Ideal for Large Sizes: | The robust design thrives in massive, large-diameter pipelines. |
| Easy Alignment: | Integrated flange holes ensure fast and precise installation. |
| Durable Performance: | Rigid construction prevents body deflection to extend seal life. |
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